/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.druid.collections;

import org.junit.Assert;
import org.junit.Test;

import java.io.Closeable;
import java.util.concurrent.atomic.AtomicLong;

public class CloseableResourceHolderTest
{
  @Test
  public void testCloseableResourceHolder()
  {
    final AtomicLong closeCounter = new AtomicLong();
    final Closeable closeable = closeCounter::incrementAndGet;
    final ResourceHolder<Closeable> holder = ResourceHolder.fromCloseable(closeable);

    Assert.assertSame(closeable, holder.get());

    holder.close();
    Assert.assertEquals(1, closeCounter.get());

    holder.close();
    Assert.assertEquals(1, closeCounter.get());

    Assert.assertThrows(IllegalStateException.class, holder::get);
  }
}
